Optimization starting and ending at the same location

SDKs python
1

I am running a delivery service, where I always need to start at (longitude_home, latitude_home). I will then have different addresses that I need to visit given in a random order. I am in doubt if the code that I use currently is correct, when my desired output should be the (longitude_home, latitude_home) followed by the order of the most efficient addresses to visit and then ending with (longitude_home, latitude_home) - returning home. I can’t seem find a detailed Python documentation on this topic

import openrouteservice
api_key = "my_api_key"
client = openrouteservice.Client(key = api_key)
coords = ((12.575486928460299, 55.73214461871051), #this is my home address 
(9.11918692080332, 55.71061418990606), #this location is given in random order
(12.046680416546385, 55.63205153126445), #this location is given in random order 
(9.564747177343802, 55.71657051416651)) #this location is given in random order

routes = client.directions(
    coords, 
    profile="driving-car",
    units = 'km',
    instructions = False,
    optimize_waypoints = True)
2

Hi @JIanWu,

you should be able to just pass your start point as last point as well. Then it should optimize all the waypoints.

best regards

3

Hi @amandus ,

I have now modified the above code. So that the first and last coordinate in the tuple corresponds to the start and end address. When I print out the return from the query, I can’t see where the order of the optimized coordinates are stored.

import openrouteservice

api_key = "api_key"
client = openrouteservice.Client(key = api_key)

coords = (
    (12.575472352731426, 55.73214631796644),
    (10.209063959459991, 56.158459973075956),
    (11.795463713656188, 55.44276562392962),
    (12.578910642243736, 55.70587182568259),
    (12.575472352731426, 55.73214631796644),
) 
 
routes = client.directions(
    coords, 
    profile="driving-car",
    units = 'km',
    instructions = False,
    optimize_waypoints = True)

print(routes)
#The below is the print(routes)
{'routes': [{'summary': {'distance': 634.449, 'duration': 23657.399999999998}, 'bbox': [9.553225, 55.298365, 12.578868, 56.160697], 'geometry': 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'way_points': [0, 2279, 4067, 4762, 4872]}], 'bbox': [9.553225, 55.298365, 12.578868, 56.160697], 'metadata': {'attribution': 'openrouteservice.org | OpenStreetMap contributors', 'service': 'routing', 'timestamp': 1664226003587, 'query': {'coordinates': [[12.575472352731426, 55.73214631796644], [10.209063959459993, 56.15845997307595], [11.795463713656188, 55.44276562392962], [12.578910642243736, 55.70587182568259], [12.575472352731426, 55.73214631796644]], 'profile': 'driving-car', 'format': 'json', 'units': 'km'}, 'engine': {'version': '6.7.0', 'build_date': '2022-02-18T19:37:41Z', 'graph_date': '2022-09-18T14:35:47Z'}}}

I can’t seem to find the order of the locations to visit.

4

Hi @JIanWu ,

The query order of the coordinates is returned in the metadata of the response.
If you want to work with it directly before the request, you can use the optimization endpoint directly instead of using the optimize_waypoints parameter for directions.

See what it does here:

best regards